61815949 has 8 divisors (see below), whose sum is σ = 70075040. Its totient is φ = 54057456.

The previous prime is 61815947. The next prime is 61815977. The reversal of 61815949 is 94951816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61815949 - 2¹ = 61815947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61815947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124887 + ... + 125380.

It is an arithmetic number, because the mean of its divisors is an integer number (8759380).

Almost surely, 2^61815949 is an apocalyptic number.

It is an amenable number.

61815949 is a deficient number, since it is larger than the sum of its proper divisors (8259091).

61815949 is a wasteful number, since it uses less digits than its factorization.

61815949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250299.

The product of its digits is 77760, while the sum is 43.

The square root of 61815949 is about 7862.3119373375. The cubic root of 61815949 is about 395.3971309032.

The spelling of 61815949 in words is "sixty-one million, eight hundred fifteen thousand, nine hundred forty-nine".